Product Overview

The Pentair Rainbow 300 Off-Line Chlorine/Bromine Tablet Feeder is a reliable automatic chemical feeder designed to make pool and spa sanitizing easier, cleaner, and more consistent. This off-line feeder installs on the pressure side of the pool system and uses slow-dissolving chlorine or bromine tablets to help maintain proper sanitizer levels with less manual handling.

The Rainbow 300 features a fully enclosed design with no escaping gases and no special venting required. It is ideal for existing pools or spas where an in-line feeder may not be practical. The feeder holds up to 11 large tablets or 98 small tablets and is designed for pools and spas from approximately 12,000 to 48,000 gallons.

SKU / Barcode

SKU: R171016
UPC / Barcode: 788379004217

Ideal For

This Pentair Rainbow 300 feeder is ideal for:

Residential pools
Spas
Retrofit installations
Equipment pads with limited plumbing space
Pool owners who want easier chlorine or bromine tablet dosing
Systems where an off-line feeder is preferred over an in-line feeder

Key Features

• Off-line automatic feeder for chlorine or bromine tablets
• Holds up to 11 large tablets or 98 small tablets
• Treats approximately 12,000 to 48,000 gallons
• Completely enclosed system with no escaping gases
• No special venting required
• Top-loading design for easier tablet refills
• Adjustable feed rate using an external control valve
• Operates on the pressure side of the pump
• Uses 1/4-inch feeder hoses, control valve, and fittings
• Rated for up to 50 PSI maximum operating pressure

Benefits

The Pentair Rainbow 300 helps reduce the need for frequent manual chemical dosing by automatically feeding chlorine or bromine into the pool or spa system. Its off-line design makes it a strong choice for existing equipment setups where cutting into the main return line may not be convenient.

The enclosed body helps reduce chemical fumes around the equipment area, while the top-loading lid makes tablet refills simple. The adjustable control valve allows pool owners or service professionals to fine-tune the sanitizer output based on pool size, usage, and water conditions.

Specifications

Customer-Facing Q&A

Q: Can this feeder be used with both chlorine and bromine tablets?
A: Yes. The Pentair Rainbow 300 is designed for use with slow-dissolving chlorine or bromine tablets.

Q: Is this an in-line or off-line feeder?
A: This is an off-line feeder. It connects using feeder hoses instead of being plumbed directly into the main return line.

Q: How many tablets does it hold?
A: It holds up to 11 large tablets or 98 small tablets, depending on the tablet size used.

Q: What pool size is this feeder designed for?
A: It is designed for pools and spas from approximately 12,000 to 48,000 gallons.

Q: Does this feeder require special venting?
A: No. The Rainbow 300 is a completely enclosed system and does not require special venting.

Q: Where is this feeder installed?
A: It installs on the pressure side of the pool pump, typically downstream of the filter and heater.

Q: Is professional installation recommended?
A: Professional installation is recommended to ensure proper setup, correct flow direction, and warranty compliance.